So ya trying to win her over? A bit of advice: don't put anything on there she's likely to have heard before. You want to introduce her to music that she'll ALWAYS associate with you. Music is dang powerful in that regard. Mix genre, mix old with new.
Not knowing what kind of music she likes, it's not an easy task, but here's a few ideas off the toppa my head...
Beautiful Girl-INXS
Fly Me to the Moon-Astrud Gilberto version
The Luckiest-Ben Folds
Walk to the Water-U2
Black Coffee-kd lang
New Slang-The Shins
July, July-The Decemberists
Walking After Midnight-Patsy Cline
Stand By Me-the Clash
Feeling Good-Nina Simone
Ooh Child-The Five Stairsteps
Here Comes Your Man-The Pixies
Wanderlust-The Delays
Love Goes On-The GoBetweens
There is a Light that Never Goes Out-The Smiths
Here, There and Everywhere-The Beatles
The Look of Love-Dusty Springfield
Windfall-Son Volt
Wake Up-Arcade Fire
Mahgeeta-My Morning Jacket
La Cienega Just Smiled-Ryan Adams
Ah...so many songs....so many girls....so little time...If I weren't married to the most beautiful woman on earth, I'd wish I were single again. Just to make Mixes.
Good luck.